1955-2nd  VIN - Model - Series Identification
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RPO = Regular Production Options

Serial Numbers locations

*ENGINE* *TRANSMISSION*
V8 Numbers = Top of Right Hand Bank at the front.
6 Cylinder Numbers = On boss at the rear of the distributor
3-speed conventional, overdrive and 4-speed = rear face.
3-speed Heavy Duty = left side at rear.
5-speed = right side rear bottom.
Automatic = left side at rear.
*REAR END* *VEHICLE*
Series 3100 = front face.  All Other = top.
Forward Control = left hand side on steering column.
Flat Face Cowl = front face of cowl top panel.
All Other = body hinge pillar.

Vehicle Serial Numbers

Example: L255B001456
L = Series*, 2 = 2nd Series, 55 = Year, B = Assembly Plant,
001456 = Unit Number beginning with 001001 at each plant regardless of Series.
* = The letter "V" prefix to the Series designation will identify models equipped with optional V-8 engine.

 
Series Designation

Ton    Series

Wheel Base (in) Model Type
H 1/2 3100 114 Flat Face Cowl Chassis, Cab Chassis, Pickup, Panel, Suburban, W/S Cowl Chassis & Cameo
M 1/2 3200 123.2 Pickup
F 1/2 3400 104 Forward Control Chassis
G 3/4 3500 125 Forward Control Chassis
J 3/4 3600 123.2 Flat Face Cowl Chassis, Cab Chassis, Pickup, Platform, Stake & W/S Cowl Chassis
K 1 3700 137 Forward Control Chassis
L 1 3800 135 Flat Face Cowl Chassis, Cab Chassis, Pickup, Panel, Platform, Stake & W/S Cowl Chassis
N 1-1/2 4100 130 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
P 1-1/2 4400 154 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
R 1-1/2 4500 128.2 Flat Face Cowl Chassis
S 2 5100 112.6 Cab Chassis
T 2 5400 136.6 Cab Chassis, Platform, Stake
U 2 5700 160.6 Cab Chassis
V 2 6100 130 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
W 2 6400 154 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
X 2 6500 172 Flat Face Cowl Chassis, Cab Chassis & W/S Cowl Chassis
Y 2 6700 194 Flat Face Cowl Chassis
Z 2 6800 220 Flat Face Cowl Chassis
SS 1-1/2HD 5100S 112.6 Cab Chassis
ST 1-1/2HD 5400S 136.6 Cab Chassis, Platform & Stake
SU 1-1/2HD 5700S 160.6 Cab Chassis
SV 1-1/2HD 6100S 130 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
SW 1-1/2HD 6400S 154 Flat Face Cowl Chassis, Cab Chassis, Platform, Stake & W/S Cowl Chassis
SX 1-1/2HD 6500S 172 Flat Face Cowl Chassis, Cab Chassis & W/S Cowl Chassis
	S = "Special" Model
 
	Series 31-3200 = Light Duty
	Series 34-35-36-37-3800  = Medium Duty
	Series 40-50-60 = Heavy Duty
	ASSEMBLY PLANTS:
	A = Atlanta
	B = Baltimore
	F = Flint
	J = Janesville
	K = Kansas City
	L = Los Angeles
	N = Norwood
	O = Oakland
	S = St. Louis
	T = Tarrytown
 

Rear Axle Identification (Chevrolet)
Example:  AF 2 12
AF = Type, series and assembly Plant designation
2 = Month
12 = Day of month

Axle numbers are stamped on the front or top of the Carrier.

Capacity (lbs) Type Ratios Series
3300 AF 3.90:1 31 and 3200 Regular Production
3300 AG 4.11:1 31 and 3200 with RPO 315
5000 CA 5.14:1 34-35-3700 Regular Production
5000 CB 5.14:1 34-35-37-3800 with RPO 295
5000 CC 4.57:1 3600 Regular Production also with RPO's 314-316-318
5000 CD 4.57:1 3600 with RPO 282
5000 CE 5.14:1 34-35-3700 with RPO's 314-316-318
7200 CF 5.14:1 3800 Regular Production, (34-35-3700 RPO 272)
11000 CG 6.17:1 4000 Regular Production
11000 CH 6.17:1 5000 Regular Production; (6000 with RPO 252)
13000 CJ 6.17:1 6000 Regular Production
15000 CM 7.20:1 5-6000 RPO 252
15000 CK 5.83/7.95 5-6000 RPO 202; also 4000 RPO 243
15000 CL 6.40/8.72 50-60 RPO 201
30000 DA 7.20:1 10400-10500-10700 with Tandem Equipment RPO 476

Front Axle Identification

Make Capacity (lbs) I-Beam Height (average) Spec Series
Chevrolet 2200 2.06 - 2.12 31-3200
Chevrolet 2500 2.19 - 2.34 3600
Chevrolet 3500 2.19 - 2.34 3800
Chevrolet 4000 2.19 - 2.34 41-4400
Chevrolet 4000 2.44 - 2.59 34-35-3700
Chevrolet 4500 2.44 - 2.59 45-5000-61-6500 (RPO 41-4400)
Chevrolet 4750 2.44 - 2.59 6702-6802
				

Engine Serial Numbers
Example:  0201234 F 255 B
0201234 = Unit Number starting with 0001001 at each source; 6 & 8 cylinder engines are numbered separately.
F = Flint; T = Tonawanda (on 8 cyl engines, 55); (on 6 cyl engines, 255)
255 = Year (2nd Series 1955)
B = Type and Series designation.

Type Series Description
X 31-3200 Thriftmaster 235 with 3-speed (regular production)
M 31-3200 Trademaster 265 with HD Clutch
SC 31-3200 Thriftmaster 235 with HD Clutch with RPO 227
DC 31-3200 Trademaster 265 RPO 408 (exc. Auto. Trans.)
B 31-3200 Trademaster 265 with Hydramatic Transmission
XA 3600 Thriftmaster 235 (regular production)
MA 3600 Trademaster 265 with HD Clutch (RPO 314)
SA 3600 Thriftmaster 235 with HD Clutch (RPO 227)
DA 3600 Trademaster 265 RPO 408 (exc. Auto. Trans.)
BA 3600 Trademaster 265 RPO 408 with Hydramatic Transmission
T 34-35-3700 Thriftmaster 235 (regular production)
L 34-35-3700 Trademaster 265 with HD Clutch (RPO 314)
XB 3800 Thriftmaster 235 (regular production)
MB 3800 Trademaster 265 with HD Clutch (RPO 314)
SB 3800 Thriftmaster 235 with HD Clutch
DB 3800 Trademaster 265 with HD Clutch RPO 409 (exc. Auto. Trans.)
BB 3800 Trademaster 265 RPO 409 with Hydramatic Transmission
S 4000 Thriftmaster 235
PA 4000 Loadmaster HD 235 (regular production) RPO 225
D 4000 Trademaster 265 RPO 409
E 5000 Taskmaster 265, 6000 RPO 409
P 6000 Thriftmaster 235
N 6000 Jobmaster 261 RPO 225

Transmission Identification

Three Speed Conventional and Overdrive
Example: M 2 28
M = Muncie; S = Saginaw
2 = Month
28 = Day of Month

Four Speed Syncro-Mesh
Example: T 2 28
T = Toledo
2 = Month
28 = Day of Month

 

Four Speed Automatic (Hydramatic)
Series 31-3200  - Orange Plate Color
Series 34-35-36-38-4000  - Black Plate Color

Three Speed Heavy Duty
Example: W B 28 5 2
W = Borg Warner 
B = Month (February)	
28 = Day of Month
5 = Year
2 = Shift
 

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